It appears to be working for me, were you able to figure it out?
(Asking for help in this board is fine)
Viewing post in Twine Game Doesn't Appear
Looks like it's working in Internet Explorer, but not in Firefox (latest version).
Can't get a HTML5 Unity game (built in Unity 5) working either, but that's a different problem caused by Unity 5 being ornery in general about its Web player replacement. At least partly so; Itch.io is telling me that even my super-basic game build has no index.html in its ZIP file, even though it definitely has one.
Thanks, but this problem is resolved and it's not Itch.io's fault. The secret for me was that if you're using Unity 5 for WebGL, you can't use try/catch statements in your code. So now https://lexington-games.itch.io/tempest-tale is available. Due to other problems with Unity 5 WebGL (the difficulty of saving complex objects, the 20-minute build time, and the UI still not scaling quite right despite my efforts) I find the Web player useless for a game that needs a complex UI and saving. I'll make my downloadable version be the main version in the next build.
Any idea why https://lexington-games.itch.io/dragon-fate , a Twine game, doesn't show up in Firefox?